摘要
通过对典型平面叶栅风洞试验段的数值模拟研究了不同来流攻角和不同来流马赫数下某高负荷扩压叶栅进口周向流场的均匀性,分析了影响叶栅进口流场均匀性的主要原因,研究了改变叶栅上壁面形状对于叶栅进口均匀性的改善效果。数值结果表明:向上游倾斜的扩压平面叶栅固有结构决定了栅前周向流场的不均匀分布:随着来流攻角增大,叶栅上侧壁的通道堵塞程度增大,导致栅前速度场和方向场的不均匀性增大,来流攻角和设定值的最大偏差超过5°;通过减小叶栅上侧壁的弯曲程度可以有效提升栅前流场的均匀程度和范围,使来流攻角和设定值的最大偏差减小至2°。
Based on the numerical simulation of typical linear cascade wind tunnel,the inflow uniformity of the highly-loaded compressor linear cascade is investigated under different incidence angle and inlet Mach number.The numerical results indicate that,the inherent structure of compressor linear cascade that tilts upstream determines the non-uniform of pitchwise distribution of inlet flow field.As the incidence angle increase,the flow blockage in the blade passage near upper wall is intensified and increases the non-uniformity of inflow velocity and direction.The maximum deviation between the actual incidence angle and the set value exceeds five degrees.Changing the curvature of upper sidewall of test cascade is effective in improving the degree and range of inflow uniformity,and the maximum deviation between the actual incidence angle and the set value reduces to two degrees.
作者
蔡明
高丽敏
刘哲
黎浩学
蔺世彦
CAI Ming;GAO Li-Min;LIU Zhe;LI Hao-Xue;LIN Shi-Yan(School of Power and Energy,Northwestern Polytechnical University,The National Key Laboratory of Aerodynamic Design and Research,Xi’an 710129,China)
出处
《工程热物理学报》
EI
CAS
CSCD
北大核心
2021年第12期3164-3169,共6页
Journal of Engineering Thermophysics
基金
国家科技重大专项(No.2017-II-0001-0013)
国家自然科学基金重点项目(No.51790512)
实验室稳定支持经费
关键词
平面叶栅风洞
压气机叶栅
均匀性
准确性
攻角
壁面形状
linear cascade wind tunnel
compressor cascade
uniformity
accuracy
incidence angle
wall shape
